need advice please


so we are preggers with our rainbow baby. according to my LMP which is 2-11 I should be 5 weeks 3 days I was in er Sunday for upper side pain my HCG level was at 71and the ultrasound they did that Dr said everything matched up to just a little over 3 weeks. they couldn't see nothing on ultrasound no blockages no abnormal signs of concern just a low level for 5 weeks I had to go back in today for a recount which it's 72 hours later my HCG level us 213. the Dr was such an ass and made me feel unsteady. has anyone experienced low HCG levels are my levels rising ok from 71-213 in 72 hours. did I just implant later. I'm praying this little angel is a sticky bean